Experimental measurement and thermodynamic modeling of phase equilibria of {CO2 + tetralin + n-alkanes (with n=6, 16)} and its binary systems

Abstract This work measured data of binary mixtures {CO 2  +  n- hexane}, {CO 2  + tetralin}, {CO 2  +  n- hexadecane} at high pressure, {tetralin +  n- hexadecane} system at low pressure, and the ternary systems {CO 2  +  n- hexane + tetralin} and {CO 2  + tetralin +  n- hexadecane} at high pressures. Two experimental methodologies were used: synthetic static method and analytical dynamic method. The data obtained at high pressure were used to determine the binary interaction parameters using the Peng-Robinson equation of state and classical mixing rules. Regarding the low pressure data, the binary interaction parameter for the {tetralin +  n- hexadecane} system was predicted by literature correlations and adjusted to correlate our experimental data. The binary parameters were also used to predict the behavior of the ternary systems {CO 2  +  n- hexane + tetralin} and {CO 2  + tetralin +  n- hexadecane} at high pressures. The model did not predict so accurately the bubble and dew pressures for the ternary systems at high temperatures and elevated CO 2 compositions using the parameters obtained from binary systems but the results were reasonable compared to experimental results.